I updated my Spark IM Client because links were not working. I had previously tried the syslink fix but now links are not working at all after the update to 2.6.3.
try removing and reinstalling / recompiling if you used the source, etc. try installing or extracting to a different directory. update your java and make sure to use the sun/oracle java jvm/jre, don’t use the open-jdk or open-jre because there may be some minute differences that could effect it.